1.high SPL 2. Waterproof 3. different tones/voltage available. 4. Easy assembly 5. RoHS compliance 1. Dimension:60mm*38mm2. Tone: Siren tone, Pulse tone, Constant tone3. SPL: min 97dB, 105dB, 110dB/1m @rated voltage4. Rated Voltage: 12VDC, 24VDC,5. Frequency: 2.8KHz, 3KHz6. Current Consumption: max:300mA7. Waterproof level: IP67 DSS100 series siren